Original sin refers to Adam’s sin in the garden in which he disobeyed God (Gen. 2:16-17; 3:1-24). Adam is the head of the human race. When Adam sinned, we all sinned with him. His fallen position is our fallen position. His guilt is our guilt. The pure image of God (imago Dei) that belonged to the first couple was marred when they sinned and all Adam’s children are born with a distorted image and a proclivity toward rebellion against God (Ps. 51:5; 58:3; Eph. 2:1-3).